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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.gravitee.management.rest.resource.param;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;

/**
 * @author David BRASSELY (brasseld at gmail.com)
 */
public abstract class AbstractParam {
    private final V value;
    private final String originalParam;

    public AbstractParam(String param) throws WebApplicationException {
        this.originalParam = param;
        try {
            this.value = parse(param);
        } catch (Throwable e) {
            throw new WebApplicationException(onError(param, e));
        }
    }

    public V getValue() {
        return value;
    }

    public String getOriginalParam() {
        return originalParam;
    }

    @Override
    public String toString() {
        return value.toString();
    }

    protected abstract V parse(String param) throws Throwable;

    protected Response onError(String param, Throwable e) {
        return Response
                .status(Response.Status.BAD_REQUEST)
                .entity(getErrorMessage(param, e))
                .build();
    }

    protected String getErrorMessage(String param, Throwable e) {
        return "Invalid parameter: " + param + " (" + e.getMessage() + ")";
    }
}